Improved mode of heating the blast in furnaces



V 3 Sheets-Sheet l. I C. C. ALGER.

Hot-Blast Oven.

Patented June 30. 1838.

mum/F.

/IIIIIII\\\\\\ AM PHOTD-LITHILCO N-Y.(0SBORNE'S PROCESS) 3 Sheets-Sheet2. C. C. ALGER Hot-Blast Oven.

Patented June 30, 1838.

AM. PHDTO'LITHQCQNN. (OSBORNE'S PR CESS.)

3 Sheets-Sheet 3. C. C. ALGER.

Hot-Blast Oven. N0. 819. Patented June 30;. 1838.

AM. PHOTOLITHOJIU. N.Y. (OSEORNEIS PROCESS.)

UNITED STATES PATENT O ICE.

' CHARLES ALGER OFJSTOOKBRIDGEZ MA SACHUSETTS.

IMPROVED MODE OF HEATiNG T H E B LA'ST IN FURNACES.

Specification forming part of Letters Patent No. SN dated June 30:18:28.

'To all whom it may concern.-

. Be it known that I, CHARLES C. ALGER, of Stockbrid e, in the county ofBerkshire and State of assachusetts, have. invented an Improvement inthe Mode of Heating the Air'at. theTunnel-Head of Blast-Furnaces, to beused l as a hot-blast in smelting-furnaces; and I do"- hereby declarethat the following is afull and exact description thereof.

. Modes of heating the air to be used for the hot-blast by thewaste heatof the top of a furnace stack have been devised and carried intooperation by others, and it is only to the particular manner in whichIcarry the heated air from'the tunnel-head'to the tuyeres that I intendto make any claim as belonging to me.

' My plan cdns'is'ts in forcing the cold'air from the blowing-cylinderthrough twelve or any "oid er preferred numberoftubes'piaced inmaresents the first course of pipes,..that marked a being the pipewhichconducts. the blast from the blowing apparatus into the series ofheating-pipes.

Fig. 2. shows the division of the dividingpipe, which is branched tocarry the blast down on opposite sides of the stack. The pipe 0'conducts the heated air into the dividing-pipe DD. The top of the stackis shown at E, the lining of the furnace being designatedby the letterO. The outside wall of the heating-oven and furnace, one foot thick, isseen at L I. The flueway from the main heating apparatus is carried intothe main chimney and divided,as shown in Fig. '3.

-' Fig; 4 represents in profileor side view the manner in whichthe tubesand elbows are plaeed inthe heating-oven. In this figure, a 7 representsthe tube by which the cold air enters .the series, andBthat' from whichthe heated air escapes, through 0, Fig. 2, to the dividing and sidepipes. The heating chamber or oven is so constructed thatthe ends of ihwhere the pipes are connected, can be readily removed for the purpose ofmaking any necessary repair without'disturbing any part of themason-work.

Fig. 5 exhibits a general section of the fur-' nace, showing theposition of the pipesin the stack, which lead the hot-air from thetunnelhead to the tuyeres. In this figure, A shows the body of thefurnaces; BB, the stone-work;

G O, the top stone-work and'level top house; 'D D, the tuyere-arches; E,the tunnel-head;

- extending to the tunnel-head. They are alsosecured .in their positionsby stout staples of wrought-iron fastened into the stone-work.

A space, G'G, isallowed around the pipes to equalize the heat.' Thisspace is continued around the crooked pipe H, Fig. 2',which is a sectionof the side pipe, showing its turn at the tunnel-head. I leave smallholes at V V,

for the purpose of trying the heat ofthe blast; X represents the placeof the mercurial gage, for showing its pressure. 4., make the placeswhere there may be small doors to be opened for the purpose ofcleaningthe pipes from dust, and Vt a door to take out the dust and to regulatethe heat by opening or closing. There is one such door at each end. Thedotted lines in this figure show'the direction of the chimney-flue tothe heating-oven arch 2.

--Instead of the mode above described of arranging the flues near thetunnel-head for heating the air, I intend sometimes to adopt thefollowing,wh ich I have essayed and found to answer the intentionperfectly well, the air heated in these tubes being in either casecouducted down to the tuyeres through tubes inclosed in the body of thestack, to preserve and augment the heat, as described:

Fig. 6 is a vertical section of the chimney. with the heating-ovenandthe tubes arranged therein, and Fig. '7 is a top view, intended toshow more perfectly the manner inwliich the tubes are connectedtogether. The pipes or.

tubes ddd are laid horizontally, and the tube.

0 e e 0 rise vertically from them, being bent into the form of theletter U inv rted, orhav- Nos. 1, 2, e, 4,,Fig.

2 sis ing semicircular fiubes csnnecting them an 5 for the purposeofrep'air-ifig the heating-tubes their upper ends anti. fitted rim-0them by C-QIIii without disturbing anyother part of the structcal joints0? oi-herwiwe, fire. The: double chimmey. shown in Fig. 1 en- Themanna-1f a-nii combining the i ables me, the use of the necessarydamptubes e e? e so t-o'conduct t me air from one 0f I ers, to governthe passage of the flame and the horizontal $111185 10 another will bereadilv heated air Lnmugh the heating-.oveu with the perceivedbythedmwings The vertical'bub utmost tummy. touch each obher at iheir'upper 01." cm" 1 $711361 claim 2* instituting my invention ends, ar athus mutually suppcrt enah w the an: mums of the above-described Themanner 0f "winging down the heated a to the my shrough tubes built inthe :vfly of the stack, herein set forth.

CHAS. 'G. ALGER.

jwfiich is'importa'ntin the highly-heated to which they are brought whenin use.

descending pipes, which carry the heateu a to the tuyeres, areimmgdiately under and a a continuation, of the horizontal tubesff, coldair from the bldwing apparatus 45mm 1 at g. The two ends 0f theheating-even i 1 i Vi'itmsses:

are built u with fire-brick or other masonry, g limm'rioBYINGTON,

t VALTIEIR \Vmm-i'r.

so as to form panels which may be takendown

